# CVE-2019-16004: Cisco Vision Dynamic Signage Director Authentication Bypass Vulnerability

> Unauthenticated remote attackers can bypass authentication on Cisco Vision Dynamic Signage Director REST API endpoints to interact with the system.

- **Severity:** Medium 6.5 (`CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 23 Sep 2020
- **Updated:** 13 Nov 2024
- **Also known as:** GHSA-mg2f-7p87-hxwv

## What is CVE-2019-16004?

CVE-2019-16004 is a medium-severity authentication bypass vulnerability in Cisco Vision Dynamic Signage Director, published on 23 Sep 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

A vulnerability in the REST API endpoint of Cisco Vision Dynamic Signage Director could allow an unauthenticated, remote attacker to bypass authentication on an affected device. The vulnerability is due to missing authentication on some of the API calls. An attacker could exploit this vulnerability by sending a request to one of the affected calls. A successful exploit could allow the attacker to interact with some parts of the API.

Weakness: CWE-306 (Missing Authentication for Critical Functionality)

## Which versions are affected by CVE-2019-16004?

It affects 1 product.


Products: Cisco Vision Dynamic Signage Director.

## How do I fix CVE-2019-16004?

No fix has been published for CVE-2019-16004 yet. Limit exposure of the affected software until one is available.

## Is CVE-2019-16004 being exploited?

There is no known exploitation of CVE-2019-16004 in the wild and no public exploit code.

## Other vulnerabilities in Cisco Vision Dynamic Signage Director

- [CVE-2019-1917](https://insights.sbomify.com/CVE-2019-1917/): Cisco Vision Dynamic Signage Director REST API Authentication Bypass Vulnerability (critical 9.1)
- [CVE-2020-3598](https://insights.sbomify.com/CVE-2020-3598/): Cisco Vision Dynamic Signage Director Missing Authentication Vulnerability (medium 6.5)
- [CVE-2020-3485](https://insights.sbomify.com/CVE-2020-3485/): Cisco Vision Dynamic Signage Director Role-Based Access Control Vulnerability (medium 6.3)
- [CVE-2021-34742](https://insights.sbomify.com/CVE-2021-34742/): Cisco Vision Dynamic Signage Director Reflected Cross-Site Scripting Vulnerability (medium 6.1)
- [CVE-2020-3491](https://insights.sbomify.com/CVE-2020-3491/): Cisco Vision Dynamic Signage Director Stored Cross-Site Scripting Vulnerability (medium 5.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2019-16004 and fix it if it is affected.

What it is: CVE-2019-16004 is a medium-severity authentication bypass vulnerability in Cisco Vision Dynamic Signage Director, published on 23 Sep 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2019-16004 in the wild and no public exploit code.

Affected product: Cisco Vision Dynamic Signage Director. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2019-16004/ (Markdown: https://insights.sbomify.com/CVE-2019-16004/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2019-16004
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2019-16004
- OSV: https://osv.dev/vulnerability/CVE-2019-16004

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From sbomify Insights: https://insights.sbomify.com/CVE-2019-16004/
Summaries are generated and may contain mistakes; the official description above is the record.